- This event has passed.
MSE David P. Pope Distinguished Lecture: Ion Migration and Its Impact on the Stability of Halide Perovskite Solar Cells – Prashant Kamat – University of Notre Dame
November 6, 2025 at 10:30 AM - 12:00 PM
The ability to tune the bandgap of metal halide perovskites by alloying different halide ions is key to advancing tandem solar cells and light-emitting displays. However, this compositional flexibility also introduces challenges, most notably, the photoinduced migration of halide ions, which can degrade device performance. A prominent manifestation is photoinduced phase segregation in mixed-halide perovskites (MHPs), leading to the formation of iodide-rich and bromide-rich domains. These inhomogeneous regions act as charge carrier traps, reducing device efficiency. The thermodynamic and redox characteristics of halide perovskites create a strong driving force for hole trapping and the oxidation of iodide species. As a result, the mobility of halide ions and their vulnerability to hole-induced oxidation are major factors governing the long-term stability of perovskite solar cells.
Surface passivation of 3D perovskites using 2D perovskites, carbazole derivatives has been reported widely. However, interfacial chemistry can pose significant challenges during long-term solar cell operation. Under light and heat, cation migration can substantially alter the 2D/3D interface, leading to performance degradation. Therefore, suppressing both halide and cation migration is essential for enhancing the long-term stability and efficiency of perovskite solar cells and light-emitting devices.
Suggested Readings:
DuBose, J. T.; Kamat, P. V. Hole Trapping in Halide Perovskites Induces Phase Segregation, Accounts of Materials Research 2022, 3, 761-771.
DuBose, J. T.; Kamat, P. V. Energy Versus Electron Transfer: Managing Excited-State Interactions in Perovskite Nanocrystal–Molecular Hybrids, Chemical Reviews 2022, 122, 12475–12494.
Chakkamalayath, J.; Hiott, N.; Kamat, P. V. How Stable Is the 2D/3D Interface of Metal Halide Perovskite under Light and Heat?, ACS Energy Letters 2023, 8, 169-171.
Szabó, G.; Kamat, P. V., How Cation Migration across a 2D/3D Interface Dictates Perovskite Solar Cell Efficiency ACS Energy Letters 2024 9 (1), 193-200
Chakkamalayath, J. et al., Photon Management Through Energy Transfer in Halide Perovskite Nanocrystal–Dye Hybrids: Singlet vs Triplet Tuning. Accounts of Chemical Research 2025, 58, 1461–1472.
Prashant Kamat
Rev. John A. Zahm, C.S.C., Professor of Science, Department of Chemistry, Biochemistry, and Radiation Laboratory, University of Notre Dame
Prashant V. Kamat is a Rev. John A. Zahm, C.S.C., Professor of Science in the Department of Chemistry and Biochemistry and Radiation Laboratory at the University of Notre Dame. He is also a Concurrent Professor in the Department of Chemical and Biomolecular Engineering. Professor Kamat has for more than four decades worked to build bridges between physical chemistry and material science to develop advanced nanomaterials that promise cleaner and more efficient light energy conversion. He has published more than 500 scientific papers that have been well recognized by the scientific community. Thomson-Reuters has featured him as one of the most cited researchers each year since 2014 (2014 -2023). He received Porter Medal in Photochemistry (2022) ACS National Storch Award in Energy Chemistry (2024). He is a Fellow of ACS, MRS, ECS and AAAS. He is also a Pravasi Fellow of the Indian National Science Academy and an Elected Fellow of American Academy of Science and Letters. He is currently serving as the Editor-in-Chief of ACS Energy Letters. (URL:Kamatlab.com)